.sk {
    position: absolute;
    top: 43px;
    left: 190px;
    border-left: 2px solid rgb(224, 11, 11);
    padding-left: 10px;
}

.sk_nav {
    height: 49px;
    width: 100%;
    border-bottom: 2px solid rgb(156, 7, 7);
}

.sk_nav1 {
    height: 100%;
}

.sj_nav .sk_nav1 .left_sk_nav {
    float: left;
    height: 100%;
    width: 200px;
}

.sk_nav .sk_nav1 .left_sk_nav li {
    float: left;
    height: 100%;
    margin: 0 30px;
    line-height: 49px;
    color: black;
    font-size: 16px;
    font-weight: 700;
}

.sk_nav .sk_nav1 .right_sk_nav {
    float: right;
    height: 100%;
}

.sk_nav .sk_nav1 .right_sk_nav li {
    float: left;
    font-size: 14px;
    line-height: 49px;
    margin: 0 30px;
}

/* -----------中间部分------------------------- */

.sk_body ul li {
    float: left;
    width: 290px;
    height: 458px;
    border: 1px transparent solid;
    overflow: hidden;
    margin-right: 13px;
}
.sk_body ul li:nth-child(4n){
    margin-right: 0;
}

.sk_body ul li:hover {
    border: 1px rgb(156, 7, 7) solid;
}